Section 102-33.350 - What do we need to consider for an exchange/sale of our aircraft parts?(a) When replacing aircraft parts through exchange/sale you-(1) Do not need approval from GSA; and(2) Must follow the provisions of this subpart and part 102-39 of this chapter.(b) Replacement parts do not have to be for the same type or design of aircraft, but you must use the exchange allowance or sales proceeds to purchase aircraft parts to support your aviation program which meet the "similarity" requirement in 41 CFR part 102-39.